1	no error
2	invalid enumerant
3	invalid value
4	invalid operation
5	stack overflow
6	stack underflow
7	out of memory
40	missing gluTessBeginPolygon
41	missing gluTessBeginContour
42	missing gluTessEndPolygon
43	missing gluTessEndContour
44	tesselation coordinate too large
45	need combine callback
100	 
101	spline order un-supported
102	too few knots
103	valid knot range is empty
104	decreasing knot sequence knot
105	knot multiplicity greater than order of spline
106	endcurve() must follow bgncurve()
107	bgncurve() must precede endcurve()
108	missing or extra geometric data
109	can't draw pwlcurves
110	missing or extra domain data
111	missing or extra domain data
112	endtrim() must precede endsurface()
113	bgnsurface() must precede endsurface()
114	curve of improper type passed as trim curve
115	bgnsurface() must precede bgntrim()
116	endtrim() must follow bgntrim()
117	bgntrim() must precede endtrim()
118	invalid or missing trim curve
119	bgntrim() must precede pwlcurve()
120	pwlcurve referenced twice
121	pwlcurve and nurbscurve mixed
122	improper usage of trim data type
123	nurbscurve referenced twice
124	nurbscurve and pwlcurve mixed
125	nurbssurface referenced twice
126	invalid property
127	endsurface() must follow bgnsurface()
128	intersecting or misoriented trim curves
129	intersecting trim curves
130	UNUSED
131	unconnected trim curves
132	unknown knot error
133	negative vertex count encountered
134	negative byte-stride encounteed
135	unknown type descriptor
136	null control point reference
137	duplicate point on pwlcurve